Step 2: Bottom Layer

In the bottom layer it is supposed to be ordered like the picture above. In the bottom layer there is need 4 gold blocks and 5 cobblestone blocks.

Step 3: Middle Layer

In the snapshot above it shows the middle you will need 4 cobblestone blocks and 1 nether reactor core. So you don't get confused I put gray wool for cobblestone on the bottom layer.

Step 4: Top Layer

In the photo above I will show the top layer for the nether reactor. Like I said on the last one, I put gray wool to show cobblestone for the lower levels so you don't get confused.

Step 5: Conclusion

All together it should look like the snapshot above. To activate the portal you should punch the core, I'm pretty sure you're supposed to use either a iron sword or stone sword. Helpful Hints 1) Put nether reactor far from you house or other values buildings, the reactor will destroy it when it forms. 2) Remember it only works on survival mode. If there is anything wrong with the information that's given please leave a comment.

Step 6: Nether Reactor Core

You will need a few things if you want to make the Nether Reactor Core to make the Nether Reactor to go to the Nether. you will need the following:

3 Diamonds 6 Iron Ingots

Now all you have to do now is just go to a crafting table and tap on the nether reactor icon to make.